Malicious PDF — malware analysis report

Static analysis result for SHA-256 85016a4a1870d447…

MALICIOUS

PDF

65.9 KB Created: 2021-03-01 17:25:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6e9b67c15ab0024793897cf24fc6c376 SHA-1: e90fae2c965f3d1a878156abb41a2b65d734a0c9 SHA-256: 85016a4a1870d4478eb28140e6c813aec4ae61dabb5edf706d92c7b5ec9c1d6d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, many of which point to disposable domains and are associated with redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a pattern of directing users to potentially harmful sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/123?utm_term=wings+of+fire+book+10+full+cover In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379217/normal_5fdb280f0ef8e.pdfIn PDF document text
    • http://xonigej.mypressonline.com/37866581870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420902/normal_5fd2945a181ea.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/problemas_sociales_en_mexico_conclusion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472481/normal_6031f61531e73.pdfIn PDF document text
    • http://shopsupergood.site/742837770177nl8w.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/robasezodafexaxigavefnkxb.pdfIn PDF document text
    • https://rozinezo.weebly.com/uploads/1/3/1/6/131636990/jojage.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedijudibo/dgjgcge/parkour_run_unblocked.pdfIn PDF document text
    • http://sesizuxewewax.mygamesonline.org/tezupupawetere.pdfIn PDF document text
    • http://masalev.ru/blitzcrank_battle_apkpdal0.pdfIn PDF document text
    • https://cdn.sqhk.co/judixixelof/vihibVt/best_sensitivity_for_pubg_mobile_lite_gyroscope.pdfIn PDF document text
    • http://msertis.xyz/imprimante_brother_hl_2240d_error_drumvr9w2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413696/normal_5fce063f570c9.pdfIn PDF document text
    • https://bipikive.weebly.com/uploads/1/3/4/3/134342269/e379e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC556 5308 bytes
SHA-256: 2763e0b0ce5cd3fddd365eb94c7641a665d5d4e969ae82aca9e0a69fedebb241
font_01_sfnt_off0000d7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A4 10324 bytes
SHA-256: f9b892958399156dbb18496d38dffe21c36bae43bb5431055fe681afe1e83dd3

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